Accelerator Physics

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2019-08-20
06:49

Focusing of 180 GeV/c pions from a point-like source into a parallel beam by a bent silicon crystal / Scandale, W (CERN) ; Arduini, G (CERN) ; Cerutti, F (CERN) ; Garattini, M (CERN ; Imperial Coll., London) ; Gilardoni, S (CERN) ; Lechner, A (CERN) ; Losito, R (CERN) ; Masi, A (CERN) ; Mirarchi, D (CERN) ; Montesano, S (CERN) et al.
At large accelerators, bent crystals are employed to deflect weakly divergent proton beams at the stages of extraction and collimation. We demonstrate that a divergent particle beam may be efficiently deflected using a crystal with a focusing entry face. [...]
2019 - 4 p. - Published in : Nucl. Instrum. Methods Phys. Res., B 446 (2019) 15-18

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2019-08-20
06:49

First experimental demonstration of forced dynamic aperture measurements with LHC ac dipoles / Carlier, F S (Nikhef, Amsterdam ; CERN) ; Tomás, R (CERN) ; Maclean, E H (CERN) ; Persson, T H B (CERN)
Diagnostics of nonlinear beam dynamics has become more important for the LHC as it advances into increasingly challenging regimes of operation, as well as for the High Luminosity LHC where machine nonlinearities will have a significantly larger impact. Limitations of traditional excitation methods at top energy, in particular due to machine protection, have pushed the development of safe alternative methods using ac dipoles to characterize the nonlinear content of the LHC. [...]
2019 - 13 p. - Published in : Phys. Rev. Accel. Beams 22 (2019) 031002 Fulltext from Publisher: PDF;

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2019-08-15
09:16

Collimation-induced experimental background studies at the CERN Large Hadron Collider / Bruce, R (CERN) ; Huhtinen, M (CERN) ; Manousos, A (CERN ; Innsbruck U. ; Aristotle U., Thessaloniki) ; Cerutti, F (CERN) ; Esposito, L (CERN) ; Kwee-Hinzmann, R (Royal Holloway, U. of London) ; Lechner, A (CERN) ; Mereghetti, A (CERN) ; Mirarchi, D (CERN) ; Redaelli, S (CERN) et al.
The data produced at the particle physics experiments at the Large Hadron Collider (LHC) contain not only the signals from the collisions, but also a background component from proton losses around the accelerator. Understanding, identifying and possibly mitigating this machine-induced background is essential for an efficient data taking, especially for some new physics searches. [...]
2019 - 18 p. - Published in : Phys. Rev. Accel. Beams 22 (2019) 021004 Fulltext from Publisher: PDF;

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2019-08-02
16:40

Mode coupling instability of colliding beams in the HL-LHC / Barraud, Laurent (Johann-Wolfgang-Goethe Univ. (DE)) ; Buffat, Xavier (CERN)
The coupling between the coherent beam-beam modes and the head-tail modes can result in strong instabilities under the effect of electromagnetic wake fields [...]
CERN-ACC-NOTE-2019-0032. - 2019. - 19 p.
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2019-07-17
12:06

Numerical and experimental studies to model and reduce the impedance in the CERN Super Proton Synchrotron (SPS) / Beck, Mario
Intensity-driven beam instabilities are studied in simulations with a refined impedance model and in experimental measurements for this thesis [...]
CERN-THESIS-2018-433 - 181 p.

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2019-07-16
17:43

Emittance growth in collision with optimised ADT settings (MD3291) / Buffat, Xavier (CERN) ; Furuseth, Sondre (EPFL - Ecole Polytechnique Federale Lausanne (CH)) ; Valuch, Daniel (CERN) ; Soderen, Martin (CERN) ; Komppula, Jani Paavo Olavi
A short end of fill experiment, aiming at evaluating the variation of the emittance growth rate on operational beams in collision when reducing the bandwidth of the transverse damper, is described in this note [...]
CERN-ACC-NOTE-2019-0028. - 2019. - 6 p.
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2019-07-16
17:34

Intensity dependance of the train instability threshold and high pile-up test with 12b trains (MD3294) / Buffat, Xavier (CERN) ; Amorim, David (Universite Grenoble-Alpes (FR)) ; Antipov, Sergey (CERN) ; Bartosik, Hannes (CERN) ; Crockford, Guy (CERN) ; Furuseth, Sondre (EPFL - Ecole Polytechnique Federale Lausanne (CH)) ; Iadarola, Giovanni (CERN) ; Levens, Tom (CERN) ; Metral, Elias (CERN) ; Mounet, Nicolas (CERN) et al.
As signs of electron cloud driven instabilities at top energy were observed in MDs in 2017 even with short trains(12b), an additional experiment was performed in 2018 to assess the intensity scaling of this instability mechanism using high intensity 12b trains available from the existing injector chain, i.e [...]
CERN-ACC-NOTE-2019-0027. - 2019. - 8 p.
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2019-07-16
16:26

Noise studies with new ADT pickups (MD4143) / Buffat, Xavier (CERN) ; Albert, Markus (CERN) ; Amorim, David (Universite Grenoble-Alpes (FR)) ; Antipov, Sergey (CERN) ; Crockford, Guy (CERN) ; Furuseth, Sondre (EPFL - Ecole Polytechnique Federale Lausanne (CH)) ; Komppula, Jani Paavo Olavi ; Kotzian, Gerd (CERN) ; Mounet, Nicolas (CERN) ; Oeftiger, Adrian (GSI - Helmholtzzentrum fur Schwerionenforschung GmbH (DE)) et al.
An experiment aiming at characterizing the performance of a new engineering prototype for the ADT pickup readout electronics with a low noise floor from the point of view of beam stability and emittance growth in collision is described in this note [...]
CERN-ACC-NOTE-2019-0026. - 2019. - 12 p.
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2019-07-11
06:00

Future circular collider injection and extraction kicker topologies and solid state generators / Barnes, M J (CERN) ; Bartmann, W (CERN) ; Burkart, F (CERN) ; Ducimetière, L (CERN) ; Goddard, B (CERN) ; Kramer, T (CERN) ; Senaj, V (CERN) ; Stadlbauer, T (CERN) ; Woog, D (CERN) ; Barna, D (Wigner RCP, Budapest) et al.
A 100 TeV center-of-mass energy frontier proton collider, in a new tunnel of 80–100 km circumference, is a central part of CERN’s Future Circular Colliders (FCC) design study. The designs of the injection and extraction systems of the FCC are initially based upon the parameters of the injection and extraction systems of the Large Hadron Collider and a preliminary study of the FCC beam optics and lattice. [...]
2019 - 12 p. - Published in : Phys. Rev. Accel. Beams 22 (2019) 071001 Fulltext: PDF;

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2019-07-08
15:48